<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="../js/vue.js">
    </script>
</head>
<body>

<!--准备容器-->
<div id="root">
    <h2>人员列表</h2>
    <input type="text" v-model="keyWord">
    <button @click="sortType = 2">年龄升序</button>
    <button @click="sortType = 1">年龄降序</button>
    <button @click="sortType = 0">原顺序</button>
    <ul>
        <li v-for="(p,index) in filPersons" :key="index">
            {{p.name}}-{{p.age}}-{{p.sex}}
        </li>
    </ul>

</div>

<script type="text/javascript">
    Vue.config.productionTip = false;

    new Vue({
        el: '#root',
        data: {
            sortType:0,//0代表原顺序，1代表降序，2代表升序
            keyWord: '',
            persons: [
                {id: '001', name: '马冬梅', age: 30, sex: '女'},
                {id: '002', name: '周冬雨', age: 25, sex: '女'},
                {id: '003', name: '周杰伦', age: 18, sex: '男'},
                {id: '004', name: '温兆伦', age: 52, sex: '男'}
            ],
        },
        computed:{
            filPersons(){
                const arr = this.persons.filter((p) => {
                    //返回条件  p.name 包含指定字段 但是indexOf(val) 返回值不存在-1  存在 >= 0
                    return p.name.indexOf(this.keyWord) !== -1
                })
                //判断是否需要排序 this.sortType!==0 => false  ==> this.sortType
                if (this.sortType){
                    arr.sort((p1,p2)=>{
                        //三目运算符
                        return this.sortType===1?p2.age-p1.age:p1.age-p2.age
                    })
                }
                return arr;
            }
        }
    })
</script>
</body>
</html>